[Hallicrafters] Piesoelectric effect case in point.

[rbethman]

Well, I'm going with Carl and lee on this.

Having just researched ceramic capacitor construction, I don't see ANY 
way that these would have the ability to become a piezo transducer, OR 
having anything to do with these old boatanchors.

You "may" want to do a bit of research also.  They also manufacture 
"dipped ceramic" capacitors.

Going back to working with what is on the bench.

On 1/2/2011 4:14 PM, Peter Bertini wrote:
> Ceramic disks use ceramic dilectrics.There are several types:
>
> http://electronics.ihs.com/collections/abstracts/eia-198-1.htm
>
>   Are you thinking of dipped mica caps?
>
> Piezo effect means the capacitor can exhibit the characteristics
> of a piezo transducer, not that is one.
>
> Pete
>
> On 1/2/11, rbethman<rbethman at comcast.net>  wrote:
>> Well, as Carl pointed out, first the proper spelling is piezo.
>>
>> I can see this with quartz.  The 1950's Shure element is one big slice
>> of quartz.
>>
>> I'm having a problem with "ceramic"  What is the ACTUAL construction of
>> "ceramic disk" capacitors?  In every application of "ceramic" materials,
>> they don't work ANYTHING like quartz.
>>
>> The best of my knowledge, disk caps have been mica for the dielectric.
>> The silver mica migration has come up quiye a bit over the years.
>>
>> Bob - N0DGN
>>
>> On 1/2/2011 3:23 PM, Roger (K8RI) wrote:
>>>> Hi Walt
>>>>
>>>> That is interesting. I personally was never fond of ceramic disks in
>>>> audio
>>>> circuits, especially for coupling. But I never expected that the effect
>>>> would be that pronounced. Thanks for the verification.